Alessandro Lanzafame (Dipartimento di Fisica e Astronomia, Università di Catania, Italy)

Gaia-ESO survey science validation: first results on young open clusters
When Feb 27, 2015 from 10:30 AM to 12:00 PM
  • Colloquium
Where SH, Lecture Hall
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The Gaia-ESO Spectroscopic Survey is obtaining high-quality spectroscopy of some 100,000 Milky Way stars using the FLAMES spectrograph at the VLT, down to V=19 mag, systematically covering all the main components of the Milky Way and providing the first homogeneous overview of the distributions of kinematics and chemical element abundances in the Galaxy. Observations of young open clusters, in particular, are giving new insights into their initial structure, kinematics, and their subsequent evolution. In this talk I shall describe the analysis of UVES and GIRAFFE spectra acquired in the fields of young clusters whose population includes pre-main sequence (PMS) stars. The analysis is applied to all stars in such fields, regardless of any prior information on membership, and provides fundamental stellar atmospheric parameters, elemental abundances, and PMS-specific parameters such as veiling, accretion, and chromospheric activity. Science validation of our analysis on the first two years of observations has lead to interesting results on the kinematic structure of two young (~10 Myr) open clusters as well as on accretion and chromospheric activity on an extensive sample of PMS stars in the first five young open clusters observed.